'The Dourhands have been driven from Thorin's Hall, Name, yet the vermin still invest these mountains.
'Seek out the Dourhands that have taken refuge in the ruins of Sarnur and defeat them then return to me. If you travel to this place, be aware that many of the creatures within are protected against weapons not of our making.
'Travel to Sarnur, south of Thorin's Hall deep within the ruins of Orodost, which can be found along the western mountains of Ered Luin.'
The Dourhands, after fleeing Throin's Hall in defeat, took refuge in the ruins of one of their ancient cities, now called by the Elves Sarnur.
Rutur has asked you to seek out the Dourhands of Sarnur and defeat them.
You should return to Rutur with news of your victory against the Dourhands of Sarnur.